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Central ring structure identified in one of the world's best-preserved impact craters

A. C. Gebhardt, F. Niessen and C. Kopsch
Central ring structure identified in one of the world's best-preserved impact craters
Geology (Boulder) (March 2006) 34 (3): 145-148

Abstract

Seismic refraction and reflection data were acquired in 2000 and 2003 to study the morphology and sedimentary fill of the remote El'gygytgyn crater (Chukotka, northeastern Siberia; diameter 18 km). These data allow a first insight into the deeper structure of this unique impact crater. Wide-angle data from sonobuoys reveal a five-layer model: a water layer, two lacustrine sedimentary units that fill a bowl-shaped apparent crater morphology consisting of an upper layer of fallback breccia with P-wave velocities of approximately 3000 m/s, and a lower layer of brecciated bedrock (velocities >3600 m/s). The lowermost layer shows a distinct anticline structure that, by analogy with other terrestrial and lunar craters of similar size, can be interpreted as a central ring structure. The El'gygytgyn crater exhibits a well-expressed morphology that is typical of craters formed in crystalline target rocks.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 3
Title: Central ring structure identified in one of the world's best-preserved impact craters
Affiliation: Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Federal Republic of Germany
Pages: 145-148
Published: 200603
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 25
Accession Number: 2006-028120
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: sects., geol. sketch map
N64°00'00" - N72°00'00", W170°00'00" - E153°00'00"
N37°00'00" - N83°00'00", W170°00'00" - E28°00'00"
N50°00'00" - N80°00'00", W170°00'00" - E60°00'00"
N66°00'00" - N70°10'00", W175°00'00" - E170°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200608
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